Base for skylight



FIG. 1 is a perspective view of the base for skylight showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image of the view shown in this Figure;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a left end elevational view thereof, the right end elevational view being a mirror image of the view shown in this Figure. 

The ornamental design for a base for skylight, as shown and described. 